Interior colour rendering of daylight transmitted through a suspended particle device switchable glazing

- CRI and CCT of SPD glauzing was calculated.
- CRI and CCT of SPD glazing was compared with double and evacuated glazing.
- SPD transmittance below 0.14 offers CRI below 80.

The colour rendering index (CRI) and correlated colour temperature (CCT) of daylight change upon transmission through a variable transmittance suspended particle device (SPD) switchable glazing. The luminous transmittance of SPD glazing was found to vary from 0.02 to 0.55 in opaque and transparent state respectively. Below 0.14 transmittance, the CRI for a particular SPD glazing was less than 80. No strong correlation was found between CCT and CRI. The CRI of SPD glazing in a transparent state was similar to double panes glazing for SPD glazing transmittance greater than 0.24.